摘要
目的通过研究隙料厚度和覆盖面积对Cercon CAD/CAM底层冠边缘和内部适合性的影响,评价Cercon CAD/CAM系统的加工精度。方法通过模拟下颌第一磨牙,加工1个不锈钢主模型。扫描后,根据不同隙料厚度和覆盖面积,分为6组,分别为S10C70、S10C90、S30C70、S30C90、S60C70、S60C90,每组6个试件。采用硅橡胶印模复制技术和图像分析系统测量底层冠内部适合性和边缘适合性。结果方差分析显示底层冠内部适合性的差异与测量位置、隙料厚度和覆盖面积有关。覆盖面积不同组间差异有统计学意义。隙料厚度10μm和30μm组间、10μm和60μm组间差异有统计学意义。内部适合性不均匀,远中与近中相对位置间、颊侧与舌侧相对位置间有显著差异。隙料厚度30μm和60μm组间差异无统计学意义。平均边缘适合性为(27.7±7.6)μm,近远中和颊舌侧间边缘适合性差异有统计学意义;近中与远中边缘适合性、颊侧与舌侧边缘适合性间差异无统计学意义。结论Cercon CAD/CAM新系统制作的氧化锆底层冠有良好的边缘和内部适合性,达到临床可接受范围。隙料厚度和覆盖面积对底层冠内部适合性有显著影响。
Objective To evaluate the accuracy of Cercon CAD/CAM system and the influence of different spacer thickness and spacer coverage area on the internal and marginal fit of the copings. Methods A stainless steel master model of first molar was replicated. After scanning, designs of copings were made with different spacer thickness and spacer coverage area. There were six groups： S10C70, S10C90, S30C70, S30C90, S60C70, S60C90. Measurements of the adaptation were performed with silicone impression material and an image analysis system. Results Univariate ANOVA showed that variation in the internal fit of copings was related to measuring location, spacer thickness and spacer coverage area. There was significant difference between different spacer coverage area groups, and significant difference between spacer thickness 10 p^m and 30 μm groups, 10 μm and 60 μm groups, no significant difference between spacer thickness 30 μm and 60 μm groups. Mean marginal fit was （27.7±7.6） μm. There was statistically significant difference between both mesial, distal marginal gaps and both buccal, lingual marginal gaps. No difference between mesial and distal marginal gaps, and between buccal and lingual marginal gaps. Conclusion The accuracy by Cercon CAD/CAM system for the marginal and internal fit of zirconium dioxide copings is well within the range of clinical acceptability. Spacer thickness and spacer coverage area have statistically significant influence on the internal fit.
出处
《华西口腔医学杂志》
CAS
CSCD
北大核心
2009年第2期195-198,共4页
West China Journal of Stomatology
关键词
计算机辅助设计与制造
适合性
氧化锆
computer aided design/computer aided manufacture
adaptation
zirconium dioxide
